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<br />COMPUTATION OF HYPOTHETICAL HYDROGRAPH
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<br /> '2-HOUR RAINFALL - SURFACE RUNOFF FROM RAINFALL-EXCESS UNITS
<br />TIME UNIT HYDRO- EXCESS IN IN SECOND-FEET BASE TOTAL
<br />IN GRAPH IN INCHES RAINFALL-EXCESS IN INCHES FLOW IN DISCHARGE
<br />HOURS SEC,- FT. PER 12 SUB-TOTAL SEC.-FT, IN SEC"FT,
<br /> tNO.15. PLATE l~) HOURS 007'/ 308" 10.9" 1.8"
<br />1 2 3 4 5 6 7 8 ; 10
<br />6 800 0
<br />12 2,900
<br />18 5,900 0.7 560 560 2,200 2,760
<br />24 8,600 2.030 2,030 2.200 4,230
<br />30 10,500 3.8 4,130 3..;40 7,170 2,200 9,370
<br />36 11,600 6.020 to.200 16,220 2,200 18,400
<br />42 11,800 10.; 7,350 22,400 8.720 38,470 2,200 40.700
<br />48 11,300 8,120 32,700 31,600 72.420 2,200 74.600
<br />54 10,100 1,8 8,260 39,900 64.300 1,440 113,900 2,200 116.000
<br />60 8,800 7,910 44,100 93,700 5,220 150,930 2,200 153,000
<br />66 7.600 7.070 44.800 114,400 10,600 176.870 2,200 179,000
<br />72 6,500 6,160 42,900 126,400 15,500 190.960 2,200 193.000
<br />78 5,500 5,320 38,400 128,600 18,900 191,220 2,200 193,000
<br />84 4,500 4,550 33,400 123,200 20.900 182.050 2,200 184,000
<br />90 3,500 3,850 28,900 110,100 21,200 164,050 2,200 166,000
<br />96 2,700 3,150 24,700 95.900 20,300 144.050 2.200 146,000
<br />102 1,960 2,450 20,900 82,800 18,200 124,350 2,200 127.000
<br />108 1,330 1.890 17.100 70,800 15,800 105,590 2,200 108,000
<br />114 940 1,370 13,300 60,000 13.700 88.370 2,200 90, 600
<br />120 630 930 10,300 49,000 11,700 71,930 2,200 74,100
<br />126 430 660 7,450 38,200 9,900 56,210 2,200 58,400
<br />132 250 440 5,050 29,400 8,100 42,990 2,200 45.200
<br />138 130 300 3,570 21,400 6,300 31,570 2,200 33,800
<br />144 50 180 2,390 14,.500 4,860 21.930 2.200 24,100
<br />150 90 1,630 10,200 3,530 15.450 2,200 17.700
<br />156 40 950 6,870 2,390 10.250 2.200 12,500
<br />162 490 4,690 1,690 6,'870 2.200 9,070
<br />168 190 2,730 1,130 4,050 2.200 6,250
<br />174 1,420 770 2,190 2,200 4,390
<br />180 S50 450 1,000 2,200 3,200
<br />186 230 230 2,200 2,430
<br />192 90 90 2,200 2,290
<br />.,.; =
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<br />DRAINAGE AREA 1100 SQ, MI.. ALL DISCHARGES ARE INSTANTANEOUS VALUES AT END OF HOUR GIVEN IN COL.1
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